The man is _____ worker. He works in _____ office. A. a, a B. a, an C. an, an
When I came back yesterday evening, my brother _______ his homework. A. is doing B. has done C. was doing
—How often do you see your grandparents? —_______. A. Five days B. Once a month C. In a week
I usually go to school on _______ foot. A. a B. the C. /
Wang Yaping is the first woman astronaut who taught lessons in space. Do you know _______?
You aren’t supposed to ask the boy to buy things for you. _______, he is too young.